The way this occurs varies between platformsthis article covers how version selection is handled on each platform. Given the version number you show, 3.4.0, you need to upgrade R (the language), not RStudio (the application). Since R versions can be installed side-by-side on a system, RStudio needs to select which version of R to run against. You can find the most recent version on the RStudio website, or you can look in the Help menu and select 'Check for updates', which will give you a download link if a newer version is available. From within RStudio, go to Help > Check for Updates to install newer version of RStudio (if available, optional). I think I need to upgrade or download a few library files. The RStudio IDE requires R version 3.0.1 or higher. This will start the updating process of your R installation by: finding the latest R version, downloading it, running the installer, deleting the installation file, copy and updating old packages to the new R installation. T20:14:38.671739Z ERROR system error 84 (Invalid or incomplete multibyte or wide character) OCCURRED AT rstudio::core::Error rstudio::r::util::::checkSpelling(const rstudio::core::json::JsonRpcRequest&, rstudio::core::json::JsonRpcResponse*) src/cpp/session/modules/SessionSpelling.cpp:225

Rstudio latest version